Answer
$f=\frac{R}{2}$
Work Step by Step
We know that $f=\frac{R}{2}$. Thus, we need to place the receiver at a distance of $\frac{R}{2}$ in front of the dish, so that the receiver can get a more intense beam at the focus.
Physics Technology Update (4th Edition)
by Walker, James S.
Published by
Pearson
ISBN 10:
0-32190-308-0
ISBN 13:
978-0-32190-308-2
Chapter 26 - Geometrical Optics - Problems and Conceptual Exercises - Page 944: 95
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